Yarn control means



06b 16, 1354. c. mm 1,977,089

Filed Feb. 14, 1934 ATTORNEY Oct. 16, 1934. F KLElN 1,977,068

YARN CONTROL MEANS Filed Feb. 14, 1934 2 Sheets-Sheet 2 l INVENTOR, 3 Frada His/r 01.7,

'ATTORNEY UNiTED STATES PATENT FECE YARN CONTROL MEANS Application February 14, 1934, Serial No. 711,284.

12 Claims. (Cl. 242-bit) This invention relates to tension means for 'yarn, thread or the like and especially to tension means of the particular class in which the yarn is made to snub a pulley to which braking l resistance is applied. One object is to construct a tension means of that particular class so that it may be adapted for use in a quill-winding or the like machine in which the yarn, after extending in the plane in which it is maintained so as to cause it to snub the pulley of said means, must extend from the pulley in a direction angularly related to such plane. Tension means of the said particular class, since it exposes the yarn itself to the minimum wiping or sliding friction (such friction being active on the pulley), is well adapted to yarn which cannot withstand such friction, and another object is to construct a tension device of that class so that the wiping friction present may be adjusted for the tensioning of the tenderest or weakest yarns as well as of other yarns.

In the drawings, Fig. 1 shows the improved tension means in side elevation on a quill-winding machine, which is only partially shown;

Fig. 2 is a plan of said means;

Fig. 3 shows said means in the side elevation opposite to that appearing in Fig. 1;

Fig. 4 is a section on line 44, Fig. 2;

Figs. 5 and 6 are, respectively, plans of the members 20 and 25; and

Fig. 7 is a section on line '7--7, Fig. 2.

In the quill-winding machine 1 there is shown a spool or bobbin 2 from which the yarn 3 is drawn and wound on the (suitably rotated) quill or other core 4, arranged with its axis horizontal, subject to the traversing action of a (suitably reciprocated) guide 5 and to a guide 6 which directs the yarn at a point relatively near the guide 5, the yarn extending from the spool up to the tension means and then downwardly therefrom to guidesb and 6. '7 is a horizontal bar forming a part of the fixed structure of the machine and, arranged above the quill, affording support for said tension means, the latter being constructed as follows:

8 is the plate-like body of an elongated bracket having near one end a top circular recess 9 to accommodate which the body is somewhat extended at one side, as at Be, there being stepped in the body centrally of the recess an upstanding stud 10. In the recess is an inverted concavo-convex disk 11 having a fiat top surface and resting upon this disk is another concavo- 55 convex disk 12 having a flat underneath face plane in which it will be clear of disk 12.

(at its convex side) both disks being loosely penetrated by the stud it. Both disks are of thin and hence fight-weight sheet metal and both are here free to rotate, thus to discourage the yarn tracking constantly in a line on either 69 disk and wearing a groove therein; the disk 11 has a central boss or hearing lid on which it is rotative and which permits it to tilt slightly under the action of the yarn and so induce the rotation. The yarn is to be entered beor tween the disks from the far side in Fig. 2. A keeper 13 in the form of an elastic metal strip extends across the disks, having a boss 13a struck up from its under side and forming an underneath socket to receive the upper end of 70 stud 10, said strip being held by a screw 14 to the body 8 with a spacing washer 15 between it and said body serving to'maintain it in a The end of said strip by which it is thus attached to the body a is at the near side in Fig. 2, and the relatively opposite end of the strip is bent down and back, as at 13h, at once to form a guide on entering the yarn between the disks and a hook or stop to prevent the travelling yarn in possibly ballooning from escaping between them. The strip may be shifted around the screw when it is required to remove thedisks or have access to recess 9 for the purpose of clearing away lint and other accumulations left by the yarn. Its return to a position where the socket at 13a will register with the stud 10, is limited by a stop pin 16 upstanding from the body 8.

The other end of the body 8 is equipped with a pulley l7 and an adjustable brake system therefor so arranged that the axis of the pulley is angularly related to that of the disks 11--12 and the yarn will extend clear, when taut between them, from the disks to the pulley. The pulley is peripherally channeled and in one face it has a concentric groove 1711 which leaves its 5 (channeled) rim 17b and its hub 17c projecting; contained in its hub is an oilless bearing 18. The body 8 has at said end and at the far side in Fig. 2 an integral brake-disk 19 whose axis is likewise angularly related to that of the disks 11l2 and which lies in a plane perpendicularly to that of said body and whose outer face is formed with a concentric groove 19a. The pulley is arranged with its grooved side facing this disk. ()utward of the pulley is a cup-shaped brake-member 20 whose open side faces outward 20 are to serve as braking means for the pulley, no

wherefore they are equipped with felt or equivalent rings 21 and 22 set in their groove 19a and recess 20a, respectively. The pulley, disk and member 20 are coaxial and centrally apertured to receive a spindle 23 which at its far end is equipped with a pair of clamping nuts 24, screwed thereon. Clamped between these nuts and hence fixed to the spindle are disks 25-26, the inner one of which is elastic and has arcuate peripheral portions 25a thereof cut away and forming spring-arms bent toward and bearing against the member 20 (disk 25 thus acting as a spring on said member) and the outer one of which forms a cover. Member 20 should be kept from rotating with the pulley, whose direction of rotation is indicated by the arrow in Fig. 3; hence said member has its bottom formed at the inside with a series of pressed-up shoulders 20b facing contrary to said direction and adapted to be engaged by the ends of the arms 25a of the disk 23 which, being non-rotative, therefore acts as a clutch as well as a spring. The ends of the arms present convex rounded surfaces (Fig. 4) to the notched zone of member 20, thus forming a cam-engagement therewith, so that while said member is held from rotation under the mere influence of the pulley if, as in wrapping the yarn around the pulley, the operators hand should tend to turn said member a slip may occur by virtue of said cam-engagement, it being apparent that if the arms were positively clutched with said member they would likely be distorted on such manual turning of said memher.

The clamping pressure exerted by the members 19 and 20 is variable in part by adjusting the nuts 24 and hence the spring 25 on the spindle 23 and in part by shifting the spindle lengthwise. For the latter purpose the free end of the spindle is bent upward, being kept from rotating by being engaged in a slot 8b of the body 8 extending lengthwise of the spindle, and said end as shown in Figs. 2 and 4, is engaged in the cam-slot 27a of a cam 2'7 which is pivoted on a screw 28 tapped into the top of said body'8, which screw may act to clamp the cam to said body in any position to which the former may be adjusted; the cam may have a scale 27b to give it the character of a gage.

Projecting from that end of the body 8 near which the disks 11-12 are located and at the near side in Fig. 2 the bracket includes an arm 29 having a depending fork (Fig. 3) equipped with a set-screw 30 by which the bracket, receiving bar 7 in the fork, is clamped to said bar so that the vertical plane of the pulley is perpendicular to the bar and the bracket in effect becomes a part of the supporting structure of the machine. The stud 10 is somewhat nearer the observer (Fig. 2) than said plane. Fixed in the far side of this arm by a set-screw 31 is a wire guide 32 which first projects parallel with the bar and close to body 8 and then is bent off toward the bar, as at 32a, such bent-off end being preferably formed as a hook.

In threading the tension means the attendant passes the yarn up through the crotch formed at 33 by the arm 29 and guide and then, shifting its upper end portion to horizontal position, passes said end portion under the hooked end of the keeper l3 and so between the disks 11-12, and thereupon, having formed one or more turns in said end portion around the pulley, extends it downward and threads it through the guides 5-6, attaching it to the core 4. When the core is in rotation the yarn is kept snubbing the pulley by the slight drag imposed on the yarn, without material sliding friction thereon, by the smooth opposed faces of the freely rotative disks 11-12. The yarn tends to remain between the disks because the guide 32, anterior and close to them, is so offset with relation to the pulley that when the yarn is taut between them the stud 10 maintains a slight bend in the yarn, any ballooning thereof being limited, as stated. by the keeper 13 so that escape of the yarn from between the pulleys is prevented; The brake system may be adjusted to vary the resistance afforded by the sliding friction it exerts on the pulley by changing the position of the nuts 24 and hence of the spring or disk 25 on the spindle 23 toward or from member 20, and by altering the position of cam 27 and hence, through the thrust-member formed by the spindle and nuts, said disk 25 toward or from said member. The first of these s a rough or general adjustment, resorted to un changing from one to another class of yarns widely different in their tension requirements, whereas the second adjustment is one resorted to more frequently or where the tension requirements of different yarns require but slight changes in the braking resistance.

According to my invention the yarn is bent around a frictionally resisted rotative pulley which it tractively engages and there .13 means, as 11-12, anterior to the pulley, to cause the yarn to snub the pulley and including elements coactive to compress the yarn and arranged with their plane of compression angularly related to the plane of rotation of the pulley. In the specific form disclosed, in which the pulley is arranged in a vertical plane, a support (as 8-11) affords a top surface (as that of 11) over which the yarn travels and a pressure element (as 12) coacts with said surface to compress between them and thereby cause the yarn to snub the pulley.

Having thus fully described my invention what I claim is:

1. Means to impose a drag on lengthwise travelling yarn including a supporting structure and a freely rotative disk having one broad side facing said structure and the opposite side adapted to be engaged by the yarn, said disk being normally held against, and freely rotative relatively to but having its lateral displacement limited by, said structure and one of them having, projecting slightly therefrom, a bearing for and located substantially centrally of the disk and on which the latter is tiltable.

2. Means to impose a drag on lengthwise travelling yarn including a supporting structure and a freely rotative disk above said structure having one broad side its lower side and the opposite side adapted to be engaged by the yarn, said disk being gravity held against, and freely rotative relatively to but having its lateral displacement limited by, said structure and one of them having, projecting slightly therefrom, a bearing for and located substantially centrally of the disk and on which the latter is tiltable.

3. In combination, a support having a surface adapted to be engaged by lengthwise travelling yarn, a revoluble pressure element coactive with said surface to compress the yarn between them, said support having means to limit the movement of said element laterally over said surface and said element being removable in a direction from said surface, and a keeper normally opposing removal of said element but movable substantially parallel with said surface out of its path to permit such removal.

4. In combination, with a support, superposed elements thereon between which the yarn is adapted to travel lengthwise, said elements being revoluble in substantially horizontal planes and said support having means to limit the movement of said elements laterally thereover and said elements being removable upwardly, and a keeper normally opposing but movable on the support in a substantially horizontal plane to permit such removal of said elements.

5. In combination, a support having a surface adapted to be engaged by lengthwise travelling yarn and a stud projecting from said surface, a pressure element coactive with said surface to compress the yarn between them and penetrated by and removable from the stud, and a keeper pivoted to the support to move substantially parallel with said surface and bearing against the free end of the stud;

6. In combination, a support having a surface adapted to be engaged by lengthwise travelling yarn and a stud projecting from said surface, a pressure element coactive with said surface to compress the yarn between them and penetrated by and removable from the stud, and a device extending crosswise of said element and the path of travel of the-yam and having its free end lateral of said element and inclined toward the latter and the support.

7. Mechanism for tensioning yarn comprising a support, a pulley around which the yarn extends and which it tractively engages having one end face presented to said support, and means to move the pulley in the direction to bring said face against the support including a thrust-member on which the pulley is journaled movable lengthwise of itself in the support, and meansto secure the thrust-member to the support in immovable relation thereto.

8.'Mechanism for tensioning yarn comprising a support, a pulley around which the yarn extends and which it tractively engages having one end face presented to said support, means to move the pulley in the direction to bring said face against the support including a thrust member on which the pulley is journaled movable lengthwise of itself in the support, means to secure the thrust-member to the support in immovable relation thereto, and elastic means interposed between the other end face of the pulley and a portion of the thrust-member.

9. Mechanism for tensioning yarn comprising a support, a pulley around which the yarn extends and which it tractively engages having one end face presented to the support, a brake member engaging the other face of the pulley,

and means, on which the pulley is journaled,

holding the brake member against the pulley and movable in a direction through the plane of rotation of the latter and including an elastic instrumentality clutched with said member.

10. In combination, means to draw yarn lengthwise, and mechanism to exert tension on the yarn while so drawn comprising a pulley revoluble around a substantially horizontal axis and having a peripheral substantially V-shaped groove and around which pulley the yarn is bent and which it tractively engages, said pulley and means being arranged one above the other, means to support and frictionally resist rotation of the pulley, the last-named means having a substantially horizontal surface over which the yarn travels anterior to the pulley, and means, opposed to said surface and bearing on the yarn, for imposing frictional resistance to the advance thereof substantially sufiicient only to cause the yarn to snub the pulley, said pulley forming a tension device by which the yarn is last tensioned anterior to the first-named means.

11. In combination, a pulley having a peripheral substantially V-shaped groove, means, in which the pulley is journaled and by which its rotation is frictionally resisted, having a top surface over which the yarn travels on its way to the pulley and a stud upstanding from said surface, one side of said stud being substantially coincident with the plane of the deepest part of the pulley groove, means, above said surface and resting on the yarn and limited by the first means-against lateral displacement, for imposing frictional resistance to the advance of the yarn, and yarn-guiding means, anterior to the stud, normally coacting with the pulley to maintain the portion of the yarn between the guiding means and pulley bent around the stud;

12. Mechanism for tensioning yarn including a revoluble pulley, brake-members bearing against the opposite end faces of the pulley, and a non-revoluble spring urging one member toward the pulley, said member and the spring having coacting clutching portions in cam-engagemeht with each other.

FREDERICK KLEIN. 

